/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.wl4g.dopaas.cmdb.shardingspherev4.servcie.impl;

import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import org.apache.shardingsphere.orchestration.center.ConfigCenterRepository;
import com.wl4g.dopaas.cmdb.shardingspherev4.servcie.ConfigCenterService;
import org.apache.shardingsphere.underlying.common.config.DataSourceConfiguration;
import com.wl4g.dopaas.cmdb.shardingspherev4.servcie.ShardingSchemaService;
import com.wl4g.dopaas.cmdb.shardingspherev4.util.ConfigurationYamlConverter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * Implementation of sharding schema service.
 */
@Service
public class ShardingSchemaServiceImpl implements ShardingSchemaService {

	@Autowired
	private ConfigCenterService configCenterService;

	@Override
	public Collection<String> getAllSchemaNames() {
		return configCenterService.getActivatedConfigCenter()
				.getChildrenKeys(configCenterService.getActivateConfigurationNode().getSchemaPath());
	}

	@Override
	public String getRuleConfiguration(final String schemaName) {
		return configCenterService.getActivatedConfigCenter()
				.get(configCenterService.getActivateConfigurationNode().getRulePath(schemaName));
	}

	@Override
	public String getDataSourceConfiguration(final String schemaName) {
		return configCenterService.getActivatedConfigCenter()
				.get(configCenterService.getActivateConfigurationNode().getDataSourcePath(schemaName));
	}

	@Override
	public void updateRuleConfiguration(final String schemaName, final String configData) {
		checkRuleConfiguration(configData);
		persistRuleConfiguration(schemaName, configData);
	}

	@Override
	public void updateDataSourceConfiguration(final String schemaName, final String configData) {
		checkDataSourceConfiguration(configData);
		persistDataSourceConfiguration(schemaName, configData);
	}

	@Override
	public void addSchemaConfiguration(final String schemaName, final String ruleConfiguration,
			final String dataSourceConfiguration) {
		checkSchemaName(schemaName, getAllSchemaNames());
		checkRuleConfiguration(ruleConfiguration);
		checkDataSourceConfiguration(dataSourceConfiguration);
		persistRuleConfiguration(schemaName, ruleConfiguration);
		persistDataSourceConfiguration(schemaName, dataSourceConfiguration);
		persistSchemaName(schemaName);
	}

	private void checkRuleConfiguration(final String configData) {
		try {
			if (configData.contains("encryptors:\n")) {
				ConfigurationYamlConverter.loadEncryptRuleConfiguration(configData);
			} else if (configData.contains("tables:\n") || configData.contains("defaultTableStrategy:\n")) {
				ConfigurationYamlConverter.loadShardingRuleConfiguration(configData);
			} else {
				ConfigurationYamlConverter.loadMasterSlaveRuleConfiguration(configData);
			}
			// CHECKSTYLE:OFF
		} catch (final Exception ex) {
			// CHECKSTYLE:ON
			throw new IllegalArgumentException("rule configuration is invalid.");
		}
	}

	private void persistRuleConfiguration(final String schemaName, final String ruleConfiguration) {
		configCenterService.getActivatedConfigCenter()
				.persist(configCenterService.getActivateConfigurationNode().getRulePath(schemaName), ruleConfiguration);
	}

	private void checkDataSourceConfiguration(final String configData) {
		try {
			Map<String, DataSourceConfiguration> dataSourceConfigs = ConfigurationYamlConverter
					.loadDataSourceConfigurations(configData);
			Preconditions.checkState(!dataSourceConfigs.isEmpty(), "data source configuration is invalid.");
			// CHECKSTYLE:OFF
		} catch (final Exception ex) {
			// CHECKSTYLE:ON
			throw new IllegalArgumentException("data source configuration is invalid.");
		}
	}

	private void persistDataSourceConfiguration(final String schemaName, final String dataSourceConfiguration) {
		configCenterService.getActivatedConfigCenter().persist(
				configCenterService.getActivateConfigurationNode().getDataSourcePath(schemaName), dataSourceConfiguration);
	}

	private void checkSchemaName(final String schemaName, final Collection<String> existedSchemaNames) {
		Preconditions.checkArgument(!Strings.isNullOrEmpty(schemaName), "schema name is invalid.");
		Preconditions.checkArgument(!existedSchemaNames.contains(schemaName), "schema name already exists.");
	}

	private void persistSchemaName(final String schemaName) {
		ConfigCenterRepository configCenterRepository = configCenterService.getActivatedConfigCenter();
		String schemaPath = configCenterService.getActivateConfigurationNode().getSchemaPath();
		String schemaNames = configCenterRepository.get(schemaPath);
		List<String> schemaNameList = Strings.isNullOrEmpty(schemaNames) ? new ArrayList<>()
				: new ArrayList<>(Splitter.on(",").splitToList(schemaNames));
		if (!schemaNameList.contains(schemaName)) {
			schemaNameList.add(schemaName);
			configCenterRepository.persist(schemaPath, Joiner.on(",").join(schemaNameList));
		}
	}
}
